Welcome to science at home episode nine, season three. In this episode we will be building the simplest electric train. The simplest electric train is another type of homopolar motor and it can also be called a magneto-electric train. The simplest electric train works by harnessing the magnetic field generated when a current passes through a coiled copper wire, to push and pull magnets on the train. This train is homopolar because its polarity is constant as it functions. By the end of this video you will be able to describe why the train moves, how magnetic forces can be used to do work and how to build the simplest electric train also known as a homopolar motor or magneto-electric train.

AAA Battery

14 to 18 Gauge Bare Copper Wire

Multiple Rare Earth Magnets

Broom Stick

Gloves

Lab Coat or Apron

Goggles

Wrap the copper wire around the broom handle in tight smooth coils. Make sure not to overlap or kink the wire.

Place the rare earth magnets on both sides of the battery. Make sure the north sides of the magnets are pointing in opposite directions.

Push the newly created train into the copper wire and watch it travel through the wire.

If you have trouble getting the train through the coil, you may need to tighten the coil or reposition the magnets.